Disk harrow.



PATENTED SEPT. 12, 190-5.

A. LINDGREN. DISK HARROW.

APPLICATION rum) JUNE 1,1905.

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PATENTED SEPT. 12, 1905.

A. LINDGREN. DISK HARROW.

APPLICATION FILED JUNE 1 1905.

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AUGUST LINDGREN, OF MOLINE, ILLINOIS, ASSIGNOR TO MOLINE PLOW COMPANY, A CORPORATION OF ILLINOIS.

DISK HARROW.

Patented Sept. 12, 1905.

A li ati fil d June 1, 1905. Serial No. 263,266-

This invention relates to disk harrows, and it consists of improved means for receivj ing and taking up the end thrust of the disk gangs, which improved means will be fullyv described in the specification and the novel features pointed out in the claims.

In the accompanying drawings, Figure 1 is a top plan view of a harrow having my invention embodied therein.

draft than that illustrated in Fig. 1. Fig. 3 is a vertical longitudinal sectional elevation on the line a a of Fig. 1, on an enlarged scale.

' Fig. 4 is a longitudinal central sectional elevation through one of the yielding bufferlinks, on an enlarged scale, on the line b b of Fig. 1. Fig. 5 is a horizontal sectional plan view showing the connection of the pivotal link for the disk gang with the frame of the machine. Fig. 6 is a transverse sectional elevation through the truss-frame on the line 0 c of Fig. 1. Fig. 7 is a diagrammatic view illustrating the movements of the disk gang and the buffer-link when the gang is adjusted and showing the amount of expansion of the spring under such adjustments.

Referring to the drawings, 1 represents a transverse frame, preferablyin the form of a truss, which is firmly fixed to the rear end of a tongue 2 and suitably braced by diagonal brace-rods 3, connected, respectively, to the ends of the truss-frame and to the sides of the tongue. Arranged in rear of the transverse frame end to end are two disk gangs 4 and 5, each of which comprises a horizontal supporting-shaft 6 and a series of disks 7 8 9, &c., mounted thereon and suitably spaced apart by intervening spools 10 in the usual manner. About midway between its ends each shaft is encircled by a bearing 11, having pivoted to it on a vertical pivot-bolt 12 the rear end of a forwardly-extending horizontal link 13, the front end of which is pivoted on a vertical bolt 14 within a bearingbox 15, fixed to the under side of the trussframe at its outer end. A stop 16 is formed in the bearing-box at the outer side of the Fig. 2 is a similar view showing the disk gangs adjusted with the disks at less inclination to the line of link in such position that while this link may swing inward on its axis to a limited extent its outward movement is prevented by this stop, the purpose of which will presently appear. Near 1ts inner end each shaft is encircled by a second bearing 17, having jointed to it by a vertical pivot-bolt 18 the rear end of a strap 19, which extends forwardly below the truss-frame and has its forward end jointed to the lower end of a vertical handlever 20. The hand-lever is mounted on the tongue in a horizontal transverse axis 21 and is provided with a locking-dog 22, engagin a toothed quadrant 23, fixed to the tongue, t e arrangement of the parts being such that by the operation of this hand-lever the inner end of the gang may be moved back and forth and the parts locked in the desired position, the disk gang during this back-andforth movement pivoting on the pivot-bolt 12, which connects the rear end of the link 13 with the bearing 11.

The connection of the straps 19 with the adjusting-lever should be such as to allow of a slight play or pivotal action between the strap and the lever in order that this connection will not interfere with the endwise movement of the gang due to the end thrust, or the same result may be attained by fastening the forward end of the strap. firmly to the lever as far as any lateral motion is concerned and forming the strap so that it will have a slight spring laterally in order that it may give to the end thrust.

In the present machine the adjusting-lever is shown adapted to operate both gangs in unison, the two connecting-straps being both connected with the lever and on opposite sides of the same. It is manifest, however, that two levers may be provided and the straps connected, respectively, with these levers in order to effect the independent ad justment of the gangs.

By the connection of the two gangswith the frame through the medium of the fore and-aft links and the adj usting-straps in the manner described the gangs are movable bodily endwise in the direction of the end thrust and are also capable of a pivotal motion around a vertical axis for the purpose of adjusting the gangs, which motion, as described, is controlled by the adjusting handlever.

In order that the endwise motion of the gangs may be suitably controlled and subjected to a cushioning action, so as to take up the end thrust to which the gangs arein practice subjected, I provide each gang with a buffer device in the form of a yielding link 24, connected, respectively, with the-adjusting-strap and with the frame of the machine and acting while holding the gangs to their work under normal conditions to yield in the event of the gangs being subjected to undue endwise pressure, such as the end thrust.

As seen in Figs. 1 and 3, each of the bufferlinks comprises a =-shape frame or yoke 25,

extended the inner end of a rod 27, encircled. by a spiral spring 28, situated Within theyoke and bearing at its inner end against'an The outer end of the rod 27 is jointed on a vertical axis to the truss-frame near the outer end of the latter, the connection of the rod with the frame being formed by thedownwardly-bent end of the rod, which isseated loosely and confined in a verticali socket formed in a bracket-plate 30, extending rearwardly from the truss-frame,

will be compressed by the inward movement of the yoke along the rod 27. served, further, that when the gangs are ad- I justed rearwardly at their inner ends in order that the disks will stand at a greater inclination to the line of draft, as shown in Fig; 1',

the buffer-springs will be subjected to a: greater degree of compression, due to the in-- creasing distance between the points of attachment of the buffer member, and the spring consequently will offer a greater resistance to the end thrust of the gangs when in this position than when the gangs are adjusted to cause the disks to stand more nearly in the line of draft, in which position the end thrust will be correspondingly less By the adjustments of the gangstherefore the resistance to the end thrust isautomatically increased as the inclination of the disks is increased. and is automatically diminished as the inclination of the disks is diminished.

By the application of the buffer devices inthe manner described the end thrust of the gangs is borne by both bearings, being received directly by the outer bearing 11' and It will be ob- The inner ends-0f the gangs are entirely disconnected, and they are consequently movable vertically independently, so as to follow any inaccuraciesin the ground, and

they may also be moved back and forth independently for the purposes of independent adjustments, which latter action may be provided for by employing, as heretofore stated, two adjusting-levers, one for each gang.

Having thus described my invention,what I claim is' 1. In a disk harrow, the combination with the disk gang, of means for adjusting the sameto vary the inclination of the disks to the line of draft, a buffer device for receiving theend thrust oft-he gang,- and means controlled by the adjustment of the gang for decreasing the-resistance ofiered by the buffer device as the plane of the'disks approach the line of'draft. adjustable head 29' on the rod and bearing on its other end against the end of the yoke.

2. In a disk harrow, the combination with a disk gang, of means for increasing and diminishing the inclination of the disks to the'line ofdraft, a' buffer device acting to re- Ysist the end thrust of'the gang, and means for increasing the resistance of the buffer when the inclination of the disks to the line 'of; draft is increased and for decreasing the resistanceof the bufier when the inclination 5 'of the disks to the line of draft is diminished.

From the construction described it Will: be observed that any motion of the gangs endwise inward is resisted at once by the spiral? spring in the buffer member, which spring:

3". In combination with'the frame, a disk gang, as link connection between the disk gang and frameformed' to permit the disk gang to move endwise, and a buffer device acting respectively on the frame and disk gang and' actingto resist the end motion of the gang.

4. The combination with the frame, of a disk gang movable endwise relative to the gang with the lever, and a yielding link connected respectively with the frame and the ,fOre-and-aft member.

6'. In. adisk harrow the combination with the frame,ofa disk gang, an inner fore-and- ,aft link pivotally connecting the disk gang withthe, frame, an outer foreand-aft link pivotally connecting the disk gang with the frame, and a yielding connection between the frame and the inner link.

7. In combination with the frame, a disk gang, two fore-and-aft linksconnecting the disk gang pivotally with the frame, and a yielding connection between the frame and one of the links.

8. In combination with the frame, a disk gang, an outer fore-and -aft link connecting the disk gang pivotally' with the frame, an

adjusting-lever, a fOre-and-aft adjusting- IIO link connected at its front end with the lever and pivoted at its rear end to the disk gang, and a yieldable link pivoted at its outer end to the frame and at its inner end to the adjusting-link.

9. In a disk harrow the combination With the frame, of a disk gang adapted to be moved endWise by end thrust, means for adjusting tion 0 the disks to the line of draft, a spiral spring acting on the disk gang and tending said disk gang to vary the inclina- 

